MPEM Terminal Number Identification

[JBosch]

On a 2005 4-Tec GTX, where are the terminals 1-21 and 1-1 on MPEM. Cannot see them from back of the plug.

 

[ski-d00]

The first 1 refers to the number one connector which is the lower right one. The next set of numbers tells you the position of the wire where 1 is the bottom right and counts to the left when looking at while connected. There are 3 rows of pin connectors, 8 in the bottom, 7 in the middle, and 8 on the top row, so 23 pin connectors although some may have blanks in the them. Then there are 3 blade connectors above those which are 24, 25, and 26 again going right to left. So, bottom right is your 1-1 wire and 1-21 is in the top row of pins third from the left.

Or, you could just find the pink and pink/black wires since those are for the fuel level resistance circuit which is what you are looking for. Those mpems are known for failing with not reading the fuel level circuit internally.

 

[JBosch]

Thanks for the information. I will check it out. I am having fuel gage problems along with the buzzer going off during operation no matter how full the tank is.

 

[ski-d00]

The typically fuel circuit mpem failure is where it won't read the level and always reads empty, hence the low fuel long beep every minute.

 

[JBosch]

Performed a continuity check across 1-1 and 1-21 and came up with about 38 ohms which corresponds well with the float height and measurement on outside of tank. Does this indicate a fuel circuit MPEM failure? Last year it was indicating fuel level off and on and the buzzer did not go on every minute but often.

 

[ski-d00]

yes

 

[JBosch]

Thanks, will look into a new MPEM.